基于iTRAQ技術對三株植物乳桿菌的比較蛋白質組學分析
[Abstract]:At present, more and more Lactobacillus plantarum have been confirmed as probiotics. Lactobacillus plantarum has many physiological functions beneficial to human health. In addition, the application of Lactobacillus plantarum in industry has attracted more and more attention. In these applications, however, Lactobacillus plantarum suffers from high salt concentrations. Lactobacillus plantarum uses a number of strategies to cope with adverse osmotic conditions. Although there have been some studies on the osmotic response of Lactobacillus plantarum, the understanding is limited. In this study, the growth curves of Lactobacillus plantarum ATCC14917, and Lactobacillus plantarum FS5-5 and Lactobacillus plantarum 208 from different sources in NaCl free medium were drawn. Then we collected the bacteria in logarithmic phase to stress them in 0 ~ 24% (w / v) NaCl medium for 3 h, studied their protein expression under two kinds of salt stress by iTRAQ. Finally, the gene expression of the selected differential protein was verified by RT-qPCR technique. 1. Their growth curves in NaCl free medium were plotted by measuring their OD600nm. According to the growth curve, the growth time points of Lactobacillus plantarum ATCC14917, Lactobacillus plantarum FS5-5 and Lactobacillus plantarum 208 in NaCl free medium were 5 h / 5 h and 6 h 路2 h respectively. Three strains of Lactobacillus plantarum were collected to grow to the middle stage of logarithmic growth in NaCl free medium for salt stress test. Then the bacteria were collected and iTRAQ test was carried out. The results showed that 350957 spectra were identified in uniprot_taxonomy_1578 library, 16669 spectra were matched, 1628 peptides were identified and 878 proteins were matched. Three strains of Lactobacillus plantarum were screened at 24% of NaCl concentration compared with 0% (w / v) and 24% (w / v) compared with 0% (w / v). A total of 867 differentially expressed protein spots were screened by using P-value0.05 as the screening condition and the multiple of difference was more than 1.2.The results showed that three strains of Lactobacillus plantarum had different protein spots compared with 0% (w / v) and 24% (w / v) respectively. In all the comparisons, the up-regulated and down-regulated protein spots were Lactobacillus plantarum ATCC14917, Lactobacillus plantarum FS5-5, Lactobacillus plantarum FS5-5, and the number of up-regulated protein spots and down-regulated protein spots of Lactobacillus plantarum ATCC14917 and Lactobacillus plantarum FS5-5 were smaller than those of Lactobacillus plantarum. The difference between the two groups was larger than that of Lactobacillus plantarum 208. The functional and metabolic pathways of differential proteins were annotated by Gene ontology (GO) database and Kyoto encyclopedia of genes and genomes (KEGG) database, and then the annotated differential proteins of three strains of Lactobacillus plantarum were compared. The results showed that the number of up-regulated protein spots and down-regulated protein spots of Lactobacillus plantarum ATCC14917 and Lactobacillus plantarum FS5-5 were smaller than those of Lactobacillus plantarum FS5-5. This may indicate that the salt stress ability of Lactobacillus plantarum ATCC14917 is equal to that of Lactobacillus plantarum FS5-5, and the salt stress ability of Lactobacillus plantarum 208 is poor. Therefore, the salt stress ability of three Lactobacillus plantarum strains from different sources is different. Under salt stress, the main proteins involved in glucose metabolism, amino acid metabolism, nucleotide metabolism, protein synthesis, stress response and transport were protein. RT-qPCR technique was used to verify the gene expression level of differential protein in iTRAQ test. The results showed that the gene expression level was basically the same as the protein expression level, which verified the accuracy of the iTRAQ results at the RNA level.
【學位授予單位】:沈陽農(nóng)業(yè)大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:Q936
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